Why not? Give it time and soon enough, everybody will be in Google+. The video conferencing is a huge attraction. If you want a social network non-geeky types will not go, you go to rstatus.com or identi.ca where they don't have features for mass consumption.
No. The only people I see who will happily pay for twitter are the marketing people. Why would I pay for sharing what I think. They can make money on what I share through ads, though. Or sell the data.
lifehacker and other gawker media entities should not be allowed to post tips on password management or the likes. they fucked up their user accounts for chrissake.